Pump.



Y. E. PIERPNT.

PUMP.

APPLICATION FILED HABA, 1912. 1,061,562. Patented May 13, 1913,

ff/C'. 03 CZ inventan lilhllillll@ titrtw tti Pitfifllilhlrl @ifffltFRANK Hlfililtftllil' PIEMONT, Oftp HORLEY, COUNTY 0l SURREY, ENGLAND,ASSIGNOR T LAM'STON MONOTYPE Mi'tCHlNE COMPANY, 0F PHILADELPHIA,PENNSYLVANIA,

A COMOMTION OIF VIRGINIA.

PUMP.

racines.

Specification of L'etters Patent.

latcntcd Muy 13,11913.

Application tiled March f1, 1912. Serial No. 681,425.

To all whom it may concern Be it known that ll, Farini; l'linnawPmnrow'r, a citizen of the United States, temporarily residing atSalford, .Hoi-ley, in the county of Surrey, England, have in vented acertain new and useful Improvement .in or Relating to Pumps; and I dohereby declare the following to be a full, clear, and exact descriptionof the same, reference being had to the accompanying drawings, formingpart of this specification, and to the iigures and letters of referencemarked thereon. v

This invention relates to pumps for type casting machines and refersparticularly to pumps which are intermittently connected with or appliedto the type mold.

The nozzle through which the molten metal is delivered to the mold isusually tapered or pointed and therefore lends itself to rapid cooling,hence it frequently happens that in the interval between the castingstrokes of the pump the metal solidilies in the nozzle and the pump isrendered inoperative. Further, metal overflows at the tip of the nozzleand solidiies there, thus preventing the nozzle seating perfectlyagainst its seat inthe mold. lt is `the chief object of this inventionto minimize or eliminate entirely these drawbacks.

According to the present invention, the pump nozzle is provided with oneor more channels, chambers or jacketed portions through which some o tthe metal which is forced up by the pump piston is passed or circulatedin such a manner as to warm up or heat the nozzle and thereby preventmetal solif'lifying on the outer side ihcre of or in the main ejectingchannel. 'lhe rcturn outlet from the channels, chambers or jacketedportions may be controlled conveniently by a valve or tap.

The invention will be described as applied to a pump nozzle of wellknown. form, it heilig understood that the invention is by no meansrestricted to this or to' any particular pump nozzle.

In the accompanying drawings illustrating a preferred form ofembodimcntMthc figure :represents a vertical section of a pump nozzlecontaiiiiing said invention.

A is the discharge branch leading from the pupap barrel.

is the nozzle, and (i a controllingj tup.

The nozzle B in thc present example is formed in two parts one of whichb is screwed, or it ma;F he otherwise secured, in the 011tlet of thedischarge branch of the pump. The other part o which forms the nozzleproper, or that part which is seated against the mold opening and isprovided with the discharge outlet b, is screwed or otherwise secured tothe part 'b so thatbetwcen these two parts b and b there exists a spaceor chamber B. The part Z) is provided with a channel Z13 communi :atingat its lower end with the bore a in the branch A, andthe outer end ofthis channel b3 discharges into the space li in line with and contiguousto the jet opi-ning b2 in the part of. As indicated in the drawings thearea of b3 is greater than that of the jet opening b2.

Leading from the lower portion' of the chamber B is a conduit or aconvenient number of conduits'B2 which serve for the return or dischargeof metal delivered into the chamber B.

On the delivery stroke of the pump the `m'etal'is forced up through thechannels. a,

b3, and out by the .jet opening b2 into the mold in suilicient quantityto fill the mold and with sufficient pressure to produce solid type. Thesuperfluous metal delivered by the pump passes into the space or chamberB thereby imparting heat to the nozzle, and this metal is returned fromthe chamber B by the passage or passages B2 back to the metal pot. Theextra heat imparted" to the nozzleby this metal prevents it cooling downto an extent which might permit metal to solidify in the nozzle or onthe outer walls thereof as aforesaid.

C is a tap or cock inserted in the return passage Bf by which metal fromthe ell-.unbcr B is returned to the metal pot, and by turning the handleC of this tap, the llow of the metal from the chamber B back to themetal pot can be reffulatcd at will. For convenience the cock may beprovided with a pointer C2 acting in conjunction with the scale or indexCa to facilitate al ready adjustment of the opening of the cock.`

What I claim is:

it nozzle for metal injecting pumps provided `with a jet opening, ametal Supply passage terminating in rear of thojet opening to form achamber in rear of said jet opening, a discharge passage for saidchamber,v and an adjustable valve in said discharge passage for varyingor adjusting `the rate of discharge therethrough.

to provide a metal receiving chamber Within the seating sectionsurrounding the discharge end of the main section, the latter alsoprovided with a discharge passagecoml5 municating With said metalreceiving chamber.

FRANK HINMN PIERPONT.

Witnesses:

H. D. JAMESON, O. J2 -WORTPL

